Mabie aiexandbe jean pave



Jan. 27, 1931. M. A. J. FAVE DYNAMO ELECTRIC MACHINE Filed Feb. 1, 1927 /nsu/a/ed Conducfor I N VEN TOR.

filf BY W 4! ZJQ ATTORNEYS.

Patented Jan. 27, 1931 a UNITED STATES PATENT OFFICE Application filed February 1, 1927, Serial 110. 165,182, and in France February 1, 1926.

The object of the present invention is the nect equidistant points of the said armature construction of dynamos having a high elecwinding to the segments 2 of the commutromotive force induced in each section of the tator. The inductors of the dynamo are armature winding. shown at 3, and the brushes at 4.

L3 The difference of potential between two According to the invention, thin conduct 5 successive commutator segments must not ing blades 5 are arranged withinthe insuexceed a certain value (about thirty volts) lating material 6 which separates the segto avoid arcing at the commutator surface. ments 2 of the commutator; the blades 5 are This usually does not allow the construcregularly spaced apart, the insulation being tion of dynamos in which the electromotive of the same thickness between the thin 60 force induced per section would be greater blades, as between the commutator segments than the limiting value. and the nearest thin blades.

It is well known that arcing between two A closed winding 7 is disposed on a lamipoints is necessarily accompanied by a disnated magnetic core 8 juxtaposed to the comsymmetry in the distribution of the electric mutator and partaking in its rotation, the o5 potentials. said windin 7 being of annular shape, and

The invention has for objectto render uniconstituted %y a conducting wire of small form the distribution of potential into the diameter. insulating material separating two succes- The winding 7 is divided into sections by sive segments of the commutator. I beg to equidistant connections 9 corresponding in 70 point out that the object of the invention is number to the commutator segments 2 and not to improve the switching, as proposed by connected to the latter. many inventors, but only to avoid or prevent On each of the sections of the ring windarcing between two successive segments of ing, supplementary tappings 10 are provided the commutator, when the E. M. F induced which are regularl spaced apart, and equal 7 in the section of the armature winding correin number to the t in blades 5 to which the sponding to these two segments is a maxisaid tappings are connected. mum, that is to say when this section reaches The laminated magnetic core, its ring winda position contiguous to a polar piece of the ing and its connections to the various commuinductor, and not when the said segments tator segments and thin blades constitutes an 6:; pass under the brushes. auto-transformer for potential distribution,

For that purpose, the invention consists in which has for effect to divide the potential inserting in the insulating material separatdifference between two successive commutaing the main segments, conducting blades tor segments into several fractions of the 5 much thinner than the said segments, these same value owing to the presence of the thin 85 blades not being adapted to cooperate with blades, the value of each potential fraction the brushes for collecting the current of the not being sufiiciently great to start and maindynamo, and in connecting the said blades, tain a superficial electric are, even when the as well as the segments, by equidistant con- E. M. F. induced in any section of the armanections with a closed winding the core of ture winding is amaximum. to which is constituted by a laminated magnetic What I claim as my invention and desire ring independent of the armature. to secure by Letters Patent is The attached drawing represents, as an In a dynamo electric machine, the combiexample only, a form of construction of the nation of an armature, having a winding, a

invention. commutator comprising segments, leads con- 95 In the illustrated example, the armature necting the said segments to certain points of the dynamo is indicated by the reference of the armature winding, insulating material numeral 1. The winding of this armature separating the segments, thin conducting is divided into several sections, in the known blades inserted in the said insulating mamanner, by conductor wires 1a which conterial in such a manner that the insulation is of same thickness between the blades and 7 between the segments and the nearest blades, a laminated core juxtaposed to the commutator, a Winding independent of the armature, arranged on the laminated magnetic core, and leads for connecting equidistant points of the said Winding to the commutator segments and to the thin blade. 1

In testimony whereof I have signed my name to this specification. MARIE ALEXANDRE JEAN FAVE. 

